Data Brief
For further information contact your local STMicroelectronics sales office.
March 2007 Rev 3 1/4
4
STEVAL-ISA017V1
Power supply for STB based on L6565 (US-110 V)
Features
■Switch mode Quasi-Resonant Flyback Power
Supply
■Input: 88 to 138 Vac (US version)
■Switching frequency: 50/60 Hz
■Output1: 12 V @ 500 mA delivering 6 W with
± 10% of stability
■Output2: 8 V @ 40 mA delivering 0.32 W with
± 15% of stability
■Output3: 5 V @ 1 A delivering 5 W with ± 5% of
stability
■Output4: 3.3 V @ 450 mA delivering 1.485 W
with ± 2% of stability
■Output5: 1.23 V @ 1 A delivering 5 W with
± 5% of stability
■Output6: 2.5 V @ 0.7A delivering 1.75 W with
± 2% of stability
General description
This document describes a reference design of a
17 W Switch Mode Power Supply dedicated to
Set-Top Box applications. The board accepts US
input voltages (90 to 265 Vrms) and delivers up to
6 W outputs. It is based on the L6565 quasi
resonant SMPS controller, working in variable
frequency mode.
The Quasi-resonant operation and the high
flexibility of the L6565 make it a very suitable
device, able to satisfy all the requirements with
only few external components.
ST components
■STTH108 High Voltage Ultrafast Rectifier, 1 A,
800 V
■SMBYW02-200 High Efficiency Fast Recovery
Rectifier Diode, 2 A, 200 V
■STPS5L40 Power Schottky Rectifier, 5 A, 40 V
■STPS5L25B low drop power Schottky Rectifier,
3 A, 40 V
■STPS340 Power Schottky Rectifier, 3 A, 40 V
■L6565 Quasi Resonant SMPS controller
■L5973D step down switching regulator up to
2.5 A
■LD29080DT25, 800 mA fixed and adjustable
output, very low dropout voltage regulator
■STD5NK50Z, N-channel zener protected
SuperMESH Power MOSFETs, 500 V,
1.22 Ohm, 4.4 A
STEVAL-ISA017V1
www.st.com
Board schematic STEVAL-ISA017V1
2/4
1 Board schematic
Figure 1. Board schematic
8V
12V
5V
3.3V
2.5V
1.23V
3.3V
12V/0.5A
8V/40mA
5V/1A
3.3V/0.45A
GND
1.23V/1.7A
2.5V/0.7A
110Vac
F1
1A T
F1
1A T
C4
10nF
200V
C4
10nF
200V
IC5 LD29080DT25IC5 LD29080DT25
Vin
1Vout 3
GND
2
C12
470µF
16V
C12
470µF
16V
R4
10K
R4
10K
C23
470µF
16V
C23
470µF
16V
R16
56 ohm
2W
R16
56 ohm
2W
R2
0 ohm
R2
0 ohm
1µH
I2
1µH
I2
TR1E
MAR5145
TR1E
MAR5145
9 7
I1A
2x47mH
I1A
2x47mH
1 2
7
TR1C
MAR5145
TR1C
MAR5145
8 6
C14
470µF
16V
C14
470µF
16V
C2
47µF
200V
C2
47µF
200V
C15
470µF
16V
C15
470µF
16V
D3
BAV21W
D3
BAV21W
R22
2.2K
R22
2.2K
R13
47K
R13
47K
6
C13
N.M.
C13
N.M.
D7 STPS5L25BD7 STPS5L25B
C7
1nF KX
C7
1nF KX
8
TR1A
MAR5145
TR1A
MAR5145
12
C1
22µF
200V
C1
22µF
200V
C16
470µF
16V
C16
470µF
16V
C9
470µF
16V
C9
470µF
16V
D4 SMBYW02-200D4 SMBYW02-200
R17
220 Ohm
R17
220 Ohm
R8
1K
R8
1K
4
+
-
D1
S1ZB80
+
-
D1
S1ZB80
R18
18.7K
1%
R18
18.7K
1%
R11
10 ohm
R11
10 ohm
9
1µH
I3
1µH
I3
C6
1nF KX
C6
1nF KX
C18 47nFC18 47nF
R12
33 ohm
R12
33 ohm
2
R3
1.5M
R3
1.5M
R19
6.98K
1%
R19
6.98K
1%
IC3
TS2431ILT
IC3
TS2431ILT
3 1
2
5
C20
220pF
C20
220pF
R20
10K
1%
R20
10K
1%
10
D8
STPS340U
D8
STPS340U
1
C11
470µF
16V
C11
470µF
16V
C10
470µF
16V
C10
470µF
16V
C21
100nF
C21
100nF
T2
BC847
T2
BC847
3
10µH
I4
10µH
I4
C19
470µF
16V
C19
470µF
16V
R7
150K
R7
150K
R10
1.5K
R10
1.5K R14
1.1 ohm
R14
1.1 ohm
IC2A
K1010 3B
IC2A
K1010 3B
3 4
11
T1
STD5NM50
T1
STD5NM50
TR1D
MAR5145
TR1D
MAR5145
7 8
C8
470µF
16V
C8
470µF
16V
IC2B
K1010 3B
IC2B
K1010 3B
12
R5
0 ohm
R5
0 ohm
I1BI1B
3 4
12
TR1B
MAR5145
TR1B
MAR5145
5 4
IC1
L6565
IC1
L6565
INV
1COMP
2VFF
3CS
4ZCD 5
GND 6
GD 7
VCC 8
R23
47K
R23
47K
R1
16 Ohm
R1
16 Ohm
R15
560 ohm
R15
560 ohm
C17
470µF
16V
C17
470µF
16V
R9 1KR9 1K
D5
9.1V
D5
9.1V
IC4 L5973DIC4 L5973D
OUT 1
SYNC
2
INH
3
COMP
4FB 5
VREF
6
GND
7
VCC
8
C22
470µF
16V
C22
470µF
16V
D6 STPS5L40D6 STPS5L40
C3
47µF
25V
C3
47µF
25V
C24
10µF
25V
C24
10µF
25V
R6
270K
R6
270K
D2
UF108G
D2
UF108G
R21
4.7K
R21
4.7K
C5
10nF
C5
10nF
STEVAL-ISA017V1 Revision history
3/4
2 Revision history
Table 1. Revision history
Date Revision Changes
09-Oct-2006 1 First issue
06-Feb-2007 2 Typo mistake on page 1
09-Mar-2007 3 Minor text change
STEVAL-ISA017V1
4/4
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